PEP 289: Generator Expressions (please comment)

[Erik Max Francis]

rzed wrote:

> I like it! How about in conjunction with the print statement?
> print "%s\n" % (s for s in strlist)
> ??

Presuming you want this to result in a series of print statements, this
sounds like a very bad idea.  All the PEP proposed is a new way of
creating an anonymous generator that uses a syntax similar to that of
list comprehensions; it doesn't actually change the way generators
themselves are already handled by the language.  Consider:

>>> def f():
...  i, j = 0, 1
...  yield i
...  yield j
...  while True:    
...   i, j = j, i + j
...   yield j
... 
>>> g = f() # g is now a generator
>>> print g
<generator object at 0x402e3bcc>
>>> print "%s" % g # this doesn't print the Fibonacci sequence
<generator object at 0x402e3bcc>

What you're suggesting would grievously sacrifice consistency at the
expense of a tiny little bit of convenience.  It isn't worth it.

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